Accurate laboratory ultraviolet wavelengths for quasar absorption-line constraints on varying fundamental constants

  title={Accurate laboratory ultraviolet wavelengths for quasar absorption-line constraints on varying fundamental constants},
  author={Maria Aldenius and Se. Johansson and McDonald Observatory and Ioa and Cambridge},
  journal={Monthly Notices of the Royal Astronomical Society},
The most precise method of investigating possible space-time variations of the fine-structure constant, alpha equivalent to (1/hc)(e(2)/4 pi epsilon(0)), using high-redshift quasar absorption lines is the many-multiplet (MM) method. For reliable results this method requires very accurate relative laboratory wavelengths for a number of UV resonance transitions from several different ionic species. For this purpose laboratory wavelengths and wavenumbers of 23 UV lines from Mg I, Mg II, Ti II, Cr… 

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